Nut anti-loosening torque vibration testing equipment

Abstract

The invention relates to the technical field of nut anti-loosening testing, and provides nut anti-loosening torque vibration testing equipment which comprises a rack, a tool mechanism and a tool mechanism. The tool mechanism comprises a measuring piece, a mounting accessory, a connecting piece, a rotating source and a detecting piece; the measuring piece is connected with the mounting accessory through the connecting piece, and the measuring piece and the mounting accessory are rotatably arranged on the rack around a first axis; the rotating source is arranged on the rack, and the power output end of the rotating source is connected to the measuring piece, the mounting accessory or the connecting piece; the measuring member has a first plane, and the mounting fitting has a second plane. A plurality of threaded holes of different specifications are formed in the second plane, the measuring hole and the threaded holes are located on the same circle, and the circle center of the circle is located on the first axis; the detection piece is arranged on the inner wall of the measuring hole. The nut anti-loosening torque vibration test equipment provided by the invention can solve the problems of torque transmission and vibration simulation distortion, and improves the consistency of test results.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of nut anti-loosening test, and particularly to a nut anti-loosening torque vibration test equipment. BACKGROUND

[0002] Nut anti-loosening is a link in mechanical engineering, especially in application scenarios that need to withstand vibration and dynamic load. The vibration test equipment is used to test the anti-loosening performance of nuts when subjected to vibration. The equipment determines the fastening effect and anti-loosening performance of nuts by simulating the vibration conditions that the nuts may encounter in the actual working environment.

[0003] The nut anti-loosening torque vibration test equipment in the related art needs to adapt to different measured nuts under the premise of testing the anti-loosening of different specifications of measured nuts, which not only increases the burden of accessory management, but also may lead to poor consistency of test results of measured nuts, and even distortion of torque transmission and vibration simulation. SUMMARY

[0004] The embodiments of the present application provide a nut anti-loosening torque vibration test equipment, which can improve the technical problem of possible distortion of torque transmission and vibration simulation due to adaptation to different sizes of measured nuts in the related art.

[0005] In a first aspect, the embodiments of the present application provide a nut anti-loosening torque vibration test equipment, comprising: a rack; a tooling mechanism arranged on the rack and used for mounting a measured screw rod and a measured nut threadedly fitted on the measured screw rod; and a test mechanism arranged on the rack and used for torque vibration test on the measured nut; the tooling mechanism comprises a measuring piece, a mounting accessory, a connecting piece, a rotation source and a detection piece; the measuring piece is connected to the mounting accessory through the connecting piece, and the measuring piece and the mounting accessory are rotatably arranged on the rack about a first axis; the rotation source is arranged on the rack, and a power output end of the rotation source is connected to the measuring piece, the mounting accessory or the connecting piece, and is used to drive the measuring piece and the mounting accessory to rotate; the measuring piece has a first plane, the mounting accessory has a second plane, and the first plane and the second plane are coplanar; a measuring hole for placing the measured screw rod is formed on the first plane, and a plurality of threaded holes of different specifications are formed on the second plane, the measuring hole and each threaded hole are on the same circle, and the center of the circle is on the first axis; the detection piece is arranged on the inner wall of the measuring hole and is used to detect the size of the measured screw rod placed in the measuring hole. Wherein, after the detection piece completes the size detection on the measured screw, the measured screw is separated from the measuring hole, the rotating source drives the mounting fitting to rotate so that the thread hole corresponding to the specification moves to the position corresponding to the measured screw, and then the measured screw is screwed into the thread hole corresponding to the specification.

[0006] The technical solution provided in the embodiments of the present application has at least the following technical effects: The nut anti-loose torque vibration test equipment provided in the embodiments of the present application comprises a rack and a tooling mechanism and a test mechanism arranged on the rack, so as to maintain stability and improve compactness. In the case where it is necessary to perform anti-loose torque vibration test on the measured nut, the detection piece on the tooling mechanism is used to perform size detection on the measured screw, so as to determine the specific specification of the thread hole on the mounting fitting. After the detection is completed, the rotating source responds and drives the mounting fitting to rotate to the predetermined position of the measured screw, and the measured screw is installed into the thread hole on the mounting fitting. The size of the measured screw can be accurately matched, so as to improve the accuracy and stability of installation. The adaptation process of the tooling mechanism is simplified, and the consistency and reliability of the test are significantly improved. The torque transmission and vibration simulation distortion problems caused by the mismatch of the fittings are reduced.

[0007] In a second aspect, the embodiments of the present application provide a nut anti-loose torque vibration test method applied to the nut anti-loose torque vibration test equipment of the first aspect. The nut anti-loose torque vibration test equipment further comprises a control device, a vibration sensor and a torque sensor. The vibration sensor is arranged on the measuring piece, and the torque sensor is arranged on the test mechanism. The control device is in communication connection with the torque sensor and the vibration sensor. The method comprises the following steps: The control device detects the specification of the measured screw located in the measuring hole through the detection piece, and determines the fitting data of the mounting fitting based on the specification of the measured screw. The fitting data indicates the thread hole corresponding to the specification of the measured screw. The rotating source is controlled to drive the mounting fitting to rotate based on the fitting data. The control device controls the test mechanism to perform anti-loose torque vibration test on the measured nut threadedly matched with the measured screw. Torque data is acquired through the torque sensor, and vibration data is acquired through the vibration sensor at the same time. Torque-vibration mixed data associated with the vibration data is extracted from the torque data, and vibration-torque mixed data associated with the torque data is extracted from the vibration data. Performing change trend analysis according to the torsional vibration mixed data, the torsional vibration mixed data and the accessory data, and generating dynamic test data; wherein the dynamic test data is used to indicate the change trend between the torque and the vibration; Performing correlation influence analysis based on the dynamic test data, and obtaining dynamic correlation data; wherein the dynamic correlation data is used to reflect the influence between the torque and the vibration. Performing effective verification on the dynamic test data and the dynamic correlation data, and obtaining test results; wherein the test results are used to reflect the anti-loosening performance of the measured nut.

[0008] The nut anti-loosening torque vibration test method control device provided by the embodiments of the present application detects the specification of the measured screw rod located in the measuring hole, and determines the accessory data of the installed accessory based on the specification of the measured screw rod; the control device controls the rotation source to drive the installed accessory to rotate based on the accessory data; the control device controls the test mechanism to perform anti-loosening torque vibration test on the measured nut screwed with the measured screw rod; the size of the measured screw rod can be automatically matched, so that a suitable threaded hole can be selected for installation; torque data is obtained through a torque sensor, and vibration data is obtained through a vibration sensor at the same time; torsional vibration mixed data associated with the vibration data is extracted from the torque data, and torsional vibration mixed data associated with the torque data is extracted from the vibration data; dynamic test data is generated by performing change trend analysis according to the torsional vibration mixed data, the torsional vibration mixed data and the accessory data; dynamic correlation data is obtained by performing correlation influence analysis based on the dynamic test data; the test results can effectively determine the anti-loosening performance of the measured nut, improve the accuracy and reliability of the test, and can realize accurate matching and testing of different specifications of the measured nut. The correlation between the torque change and the vibration is directly captured instead of testing the torque or the vibration alone, the torque transmission and vibration simulation distortion problem caused by the mismatch of the accessory are reduced, and the accuracy and consistency of the test are improved. BRIEF DESCRIPTION OF DRAWINGS

[0009] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0010] Figure 1 The structural schematic diagram of the nut anti-loosening torque vibration test equipment provided by the embodiments of the present application; Figure 2 The structural schematic diagram of the tooling mechanism and the test mechanism provided by the embodiments of the present application; Figure 3A structural schematic diagram of the mounting accessory and the measuring piece provided by the embodiment of the present application is shown in the figure; Figure 4 A structural schematic diagram of the mounting accessory, the measuring piece and the detecting piece provided by the embodiment of the present application is shown in the figure; Figure 5 A flowchart of the nut anti-loosening torque vibration test method provided by the embodiment of the present application is shown in the figure; Figure 6 An implementation flowchart of step S600 in the nut anti-loosening torque vibration test method provided by the embodiment of the present application is shown in the figure; Figure 7 An implementation flowchart of step S800 in the nut anti-loosening torque vibration test method provided by the embodiment of the present application is shown in the figure; Figure 8 An implementation flowchart of step S700 in the nut anti-loosening torque vibration test method provided by the embodiment of the present application is shown in the figure; Figure 9 A structural schematic diagram of the nut anti-loosening torque vibration test system provided by the embodiment of the present application is shown in the figure; Figure 10 A structural schematic diagram of the control device provided by the embodiment of the present application is shown in the figure.

[0011] In the figure, the reference numerals are as follows: 100, nut anti-loosening torque vibration test equipment; 10, rack; 20, tooling mechanism; 21, measuring piece; 2101, measuring hole; 211, first plane; 22, mounting accessory; 221, second plane; 222, third plane; 2201, threaded hole; 2202, positioning hole; 23, connecting piece; 24, rotation source; 25, detecting piece; 26, gripping assembly; 261, guide rail; 262, support plate; 263, bottom plate; 264, back plate; 265, triangular rib plate; 266, mounting plate; 30, test mechanism. DETAILED DESCRIPTION

[0012] In order to make the technical problems, technical solutions and beneficial effects of the present application more clearly understood, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application.

[0013] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present application. The terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of the drawings are intended to cover non-exclusive inclusion.

[0014] It should be noted that, when an element is referred to as being "fixed" or "set up" on another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or indirectly connected to the other element.

[0015] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, specify the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0016] In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first", "second", etc. can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0017] In the present application, "and / or" is only a description of the association relationship of the associated objects, which means that there can be three relationships; for example, A and / or B can mean that there are three cases of A alone, A and B together, and B alone. In addition, the character " / " in this paper generally represents a "or" relationship between the front and rear associated objects.

[0018] It should be noted that in the present application, the words "in some embodiments", "exemplarily", "for example" and the like are used to represent as an example, illustration or description. Any embodiment or design scheme described as "in some embodiments", "exemplarily", "for example" in the present application should not be interpreted as more preferred or more advantageous than other embodiments or design schemes. Rather, the use of "in some embodiments", "exemplarily", "for example" and the like is intended to present the relevant concept in a specific way, meaning that the specific features, structures or properties described in conjunction with the embodiments can be included in at least one embodiment of the present application. The occurrence of the above words at various places in the specification does not necessarily mean the same embodiment, nor is it an independent or alternative embodiment that is not mutually exclusive with other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0019] Nut anti-loosening is a link in mechanical engineering, especially in application scenarios that need to withstand vibration and dynamic load. The vibration test equipment is used to test the anti-loosening performance of the nut when it is subjected to vibration. The equipment determines the tightening effect and anti-loosening performance of the nut by simulating the vibration conditions that the nut may encounter in the actual working environment.

[0020] In the field of nut anti-loosening performance testing, when testing the anti-loosening performance of the measured nut, especially when testing different specifications of the measured nut, a key, often overlooked but extremely time-consuming and error-prone link is to select the appropriate installation component or adapter (i.e. "mounting accessory" in this application) for the measured nut; among them, the measured nut has many specifications (M3, M4, M5,..., M30+; different pitch, height, etc.), different nuts need different mounting accessories to reliably clamp, transmit torque and simulate actual working conditions. Before testing, the appropriate mounting accessory must be selected for the current measured nut.

[0021] In the prior art, the operator needs to measure or judge the key dimensions (such as inner diameter, opposite side width, height) of the nut by hand tool or experience, according to the measurement result, the operator needs to consult the specification table, compare the sample cabinet or rely on experience memory, find the matching one from different specifications of the mounting accessory, find the correct mounting accessory, the operator needs to manually disassemble the original tooling on the equipment (may be left by the last test), then manually install the selected new accessory, finally install and fix the measured nut, so the multiple processes of measurement, selection, replacement of accessories greatly prolong the test time of a single sample, limit the test throughput, and frequent manual replacement of accessories, operation of measuring tools, especially near high-speed rotating equipment, increase the risk of injury to the operator; in addition, relative to different operators or the same operator in different states, there are operation differences, which will cause inconsistent test conditions (especially clamping state), affect the comparability of test data, and further cause torque transmission and vibration simulation distortion.

[0022] Based on this, in order to improve the problem in the related art that torque transmission and vibration simulation may be distorted due to adaptation to different sizes of the measured nut, the embodiments of the present application provide the following solutions.

[0023] Please refer to Figures 1 to 4 The embodiments of the present application provide a nut anti-loosening torque vibration test equipment 100, which comprises a rack 10, a tooling mechanism 20 and a test mechanism 30. The tooling mechanism 20 is arranged on the rack 10 and is used to install the measured screw and the measured nut threaded on the measured screw.

[0024] The testing mechanism 30 is arranged on the rack 10 and is used for performing torque vibration testing on the nut to be tested.

[0025] The tooling mechanism 20 comprises a measuring member 21, a mounting fitting 22, a connecting member 23, a rotating source 24 and a detecting member 25, wherein: The measuring member 21 is connected to the mounting fitting 22 through the connecting member 23, and the measuring member 21 and the mounting fitting 22 are rotatably arranged on the rack 10 about a first axis; the rotating source 24 is arranged on the rack 10, and a power output end of the rotating source 24 is connected to the measuring member 21, the mounting fitting 22 or the connecting member 23, and is used for driving the measuring member 21 and the mounting fitting 22 to rotate.

[0026] The measuring member 21 has a first plane, and the mounting fitting 22 has a second plane 221, and the first plane 211 and the second plane 221 are coplanar; a measuring hole 2101 for placing the screw to be tested is formed on the first plane, and a plurality of threaded holes 2201 of different specifications are formed on the second plane 221, the measuring hole 2101 and each threaded hole 2201 are on the same circle, and the center of the circle is on the first axis.

[0027] The detecting member 25 is arranged on the inner wall of the measuring hole 2101 and is used for detecting the size of the screw to be tested placed in the measuring hole 2101.

[0028] After the detecting member 25 completes the size detection on the screw to be tested, the screw to be tested is separated from the measuring hole 2101, and the rotating source 24 drives the mounting fitting 22 to rotate so that the threaded hole 2201 corresponding to the specification moves to a position corresponding to the screw to be tested, and then the screw to be tested is screwed into the threaded hole 2201 corresponding to the specification.

[0029] It can be understood that the rack 10 is a support structure of the whole device, which provides a stable foundation so that the tooling mechanism 20 and the testing mechanism 30 can be accurately executed. The tooling mechanism 20 can be a structure capable of mounting the screw to be tested and the nut to be tested mounted on the screw to be tested, but is not limited thereto.

[0030] The testing mechanism 30 can be a device capable of applying a preset torque to the nut to be tested and simulating a vibration environment, which can comprise a torque applying device and a vibration simulating device. The torque applying device is used for applying a preset torque to the nut to be tested to simulate the fastening force that the nut can be subjected to in actual application. The vibration simulating device is used for simulating the vibration condition that the nut can encounter in actual application, so as to determine the anti-loosening performance of the nut in the vibration environment. The torque applying device and the vibration simulating device can be devices in the prior art, i.e. the torque applying device can be an electric torque wrench, the vibration simulating device can be a vibration table, etc., and can also be a structure in the prior art which can also achieve torque vibration testing on the nut, but is not limited thereto.

[0031] The measuring member 21 can be a structure for placing the measured screw, for example, a circular block structure with a through hole in the center position, etc., but is not limited thereto. The mounting fitting 22 can be a structure for cooperating with different specifications of the measured screw, for example, a circular ring structure with a notch, etc., but is not limited thereto. The connecting member 23 is a structure capable of connecting the measuring member 21 and the mounting fitting 22, for example, a rod-shaped structure, etc., but is not limited thereto.

[0032] The rotating source 24 is a component for driving the measuring member 21 and the mounting fitting 22 to rotate, for example, can include a rotary motor, the power output end of which is connected to the measuring member 21, the mounting fitting 22 or the connecting member 23. The detection member 25 is a component capable of detecting the diameter of the measured screw, for example, a laser ranging sensor, etc., but is not limited thereto. The laser ranging sensor can be used for non-contact measurement of the diameter of the measured screw, that is, specifically, the laser ranging sensor can be arranged on the inner wall of the measuring hole 2101, in the case where the axis of the measured screw coincides with the axis of the measuring hole 2101, the laser ranging sensor detects the distance of the measured screw, and then the diameter of the measured screw is obtained by subtracting the distance of the measured screw detected by the laser ranging sensor from the diameter of the measuring hole 2101, and then subtracting the distance of the measured screw detected by the laser ranging sensor again. It can also be that an electric resistance sensor is arranged on the support structure where the measuring member 21 is located, in the case where the measured screw is placed on the support structure, the electric resistance sensor detects the electric resistance formed by the measured screw, and the region where the electric resistance value changes is determined, so as to determine the diameter of the measured screw.

[0033] As can be seen from the above, the nut anti-loose torque vibration test equipment 100 provided by the embodiment of the application includes a rack 10 and a tooling mechanism 20 and a test mechanism 30 arranged on the rack 10, so as to maintain its stability and improve the compactness of the structure; in the case where it is necessary to perform anti-loose torque vibration test on the measured nut, the detection member 25 on the tooling mechanism 20 is used to detect the size of the measured screw, so as to determine the specific specification of the threaded hole 2201 on the mounting fitting 22, when the detection is completed, the rotating source 24 responds and drives the mounting fitting 22 to rotate to the predetermined position of the measured screw, and the measured screw is installed into the threaded hole 2201 on the mounting fitting 22, which can accurately match the size of the measured screw, so as to improve the accuracy and stability of the installation, not only simplifying the adaptation process of the tooling mechanism 20, but also significantly improving the consistency and reliability of the test, and reducing the torque transmission and vibration simulation distortion problem caused by the mismatch of the fittings.

[0034] In the implementation process, the steps of placing the measured screw in the measuring hole, moving the measured screw out of the measuring hole, placing it in the threaded hole, and finally rotating the threaded hole can be performed by a technician. Although manual operation is possible, the pre-tightening force cannot be guaranteed to be consistent due to the use of different rotating tools, and manual operation can pose safety risks. Therefore, in some embodiments of the present application, please refer to Figure 1 and Figure 2 The tooling mechanism 20 further comprises a gripping assembly 26 disposed on the rack 10, which is used to grip the measured screw to make it disengage from the measuring hole 2101 after the detection member 25 completes the size detection of the measured screw, and is used to rotate the measured screw into the corresponding threaded hole 2201 of the corresponding specification after the rotating source 24 drives the mounting fitting 22 to rotate so that the threaded hole 2201 of the corresponding specification moves to a position corresponding to the measured screw.

[0035] It can be understood that the gripping assembly 26 can be a component for gripping the measured screw to make it disengage from the measuring hole 2101 after the detection member 25 completes the size detection of the measured screw, and rotating the measured screw into the corresponding threaded hole 2201 of the corresponding specification after the rotating source 24 drives the mounting fitting 22 to rotate so that the threaded hole 2201 of the corresponding specification moves to a position corresponding to the measured screw, which can include a guide rail, a mounting plate mounted on the guide rail, the mounting plate sliding up and down on the guide rail, and a rotating member and a clamping jaw disposed on the rotating member on the mounting plate; that is, the clamping jaw moves up and down by the mounting plate sliding up and down on the guide rail, and the clamping jaw grips the measured screw after moving to the position of the measured screw. The clamping jaw can be internally provided with a control member to control the clamping and release of the clamping jaw, and the control member is in communication connection with a control device. Among them, the guide rail 261 is used to cooperate with the back plate 264 to make the clamping assembly 26 mounted on the back plate 264 move; the back plate 264 is used to mount the clamping assembly 26; the support plate 262 is used to support and mount the guide rail; the bottom plate 263 is used to mount the mounting plate 266; and the triangular rib plate 265 is used for limiting.

[0036] In this way, after the detection member 25 completes the size detection of the measured screw, the measured screw does not need to be manually disassembled or installed, the measured screw is gripped by the clamping jaw of the gripping assembly 26, so that the measured screw disengages or is placed in the measuring hole 2101, at the same time, the rotating source 24 drives the mounting fitting 22 to rotate, so that the threaded hole 2201 of the corresponding specification moves to a position corresponding to the measured screw, at this time, the clamping jaw moves the measured screw to the position of the threaded hole 2201, the measured screw is rotated by the clamping jaw and driven by the rotating member, so that the measured screw is rotated into the threaded hole 2201, realizing the rapid installation of the measured screw, further improving the test efficiency, avoiding the operation difference that may occur when the measured screw is manually disassembled and installed, improving the accuracy and reliability of the test, and further solving the problem of manual operation.

[0037] Wherein, in industrial production and engineering applications, the measured nut and the measured screw rod have various specifications, which is an inevitable phenomenon. On the one hand, different industries have different requirements for the specifications of threaded fasteners 23. For example, engine cylinder bolts in the automobile manufacturing industry are usually M10-M16, while micro-sized M3-M5 nuts are often used in the field of precision instruments to fix circuit boards, and high-strength bolts of M20 or above are required for chassis connection of large engineering machinery. According to industry statistics, there are more than 50 common threaded specifications in the general machinery field, and if non-standard custom parts are included, the specification system will be complex. On the other hand, if the traditional test equipment is designed to be specific, the enterprise needs to purchase more than 10 sets of equipment to meet all the testing, which increases the initial investment cost by 6-8 times, and the idle rate of the equipment is often as high as 40% or more. Moreover, when replacing different specifications of equipment, the sensor needs to be recalibrated and the vibration parameters need to be adjusted, and the average time for a single switch is 45 minutes. For multi-batch and small-batch testing scenarios, the equipment switching time ratio even exceeds the actual testing time. Each dedicated equipment needs a separate installation station and maintenance space. For laboratories or production workshops, multiple equipment layouts will reduce the site utilization rate by 0%-50%. In addition, from the consistency of test data, the sensitivity of sensors of different equipment and the response characteristics of the vibration table have inherent differences, and the test results of the same batch of measured nuts on different equipment may have a deviation of ±5% or more, which affects the objectivity of product quality testing.

[0038] Therefore, in the scheme of the present application, other measured nut models can also be completed on one device, as follows: Figure 3 And Figure 4 The mounting fitting 22 and the measuring piece 21 are detachably connected through the connecting piece 23.

[0039] It can be understood that the inner measurement of the mounting fitting 22 can be provided with a detachable interface for connecting and cooperating with the connecting piece 23. Similarly, one side of the measuring piece 21 can also be provided with a detachable interface for connecting and cooperating with the connecting piece 23. The detachable connection can be that the connecting piece 23 is provided with threads at both ends, and the measuring piece 21 and the mounting fitting 22 are both provided with threaded holes, so that the threads at both ends of the connecting piece 23 are respectively matched and fixed with the threaded holes of the measuring piece 21 and the mounting fitting 22. It can also be achieved by using a latch structure, but is not limited thereto.

[0040] In this way, when different specifications of the measured nut need to be tested (which can be other models of measured nuts or non-standard models), only the mounting fitting 22 needs to be replaced, without the need to replace the entire tooling mechanism 20, thereby improving the versatility and flexibility of the testing equipment. The process of replacing the mounting fitting 22 is simple and fast, greatly shortening the testing preparation time, solving the cost and efficiency problem of multi-specification testing, ensuring the data comparability of different specifications of the measured parts in the same testing environment, and ultimately realizing the intensive use of equipment resources and standardized management and control of the testing process.

[0041] Optionally, in some embodiments, referring to Figure 3 and Figure 4 , the mounting fitting 22 is a ring structure with a notch, the measuring member 21 is located in the notch, and the connecting member 23 is located on the inner side of the mounting fitting 22.

[0042] In this way, the notch provides sufficient space for the measuring member 21 to accurately measure the size of the measured screw, ensuring the accuracy of the measurement and improving the stability of the tooling mechanism 20. Further, the measuring member 21 located in the notch can also function to position the mounting fitting 22. When the rotating source 24 drives the mounting fitting 22 to rotate to the predetermined position of the measured screw, the measuring member 21 can lift the mounting fitting 22 to accurately align with the measured screw, thereby smoothly installing the measured screw into the threaded hole 2201 on the mounting fitting 22. The positioning method is simple and effective, greatly improving the efficiency and accuracy of the test.

[0043] Optionally, in some embodiments, referring to Figure 4 , a plurality of positioning holes 2202 are circumferentially formed on the mounting fitting 22 around the first axis; the tooling mechanism 20 further includes a fixing member movably arranged on the rack 10, for inserting into the corresponding positioning hole 2202 after the rotating source 24 drives the mounting fitting 22 to rotate to move the threaded hole 2201 of the corresponding specification to correspond to the position of the measured screw.

[0044] It can be understood that the fixing member is a structure capable of cooperating with the positioning hole 2202, for example, a circular structure. Before cooperating with the positioning hole 2202, the threaded hole 2201 of the mounting fitting 22 needs to be in contact with the measured screw rod for installation. At this time, the fixing member can be driven by the telescopic end of the micro telescopic mechanism to extend and move into the fixed slot, so as to cooperate and fix the fixing member with the positioning hole 2202. The fixing member can be multiple, for example, three, but is not limited to this. The positions of the three fixing members can be set as follows: two of the fixing members are set at both ends of the notch, and the last one is set at the middle position of the mounting fitting 22. In the case of three fixing members, the three fixing members can be driven by one telescopic member, for example, the telescopic end of the telescopic member is connected with a horizontal plate, the horizontal plate is connected with the three fixing members, and then the three fixing members are connected.

[0045] In this way, after the rotating source 24 drives the mounting fitting 22 to rotate to the predetermined position of the measured screw rod, the fixing member can quickly insert into the corresponding positioning hole 2202, thereby firmly fixing the mounting fitting 22 on the rack 10. This fixing method is not only quick and simple, but also can effectively prevent the mounting fitting 22 from accidentally rotating or deviating during the installation of the measured screw rod or the torque vibration test, thereby further improving the accuracy and safety of the test, and making the test process more reliable.

[0046] Optionally, in some embodiments, referring to Figure 4 , the mounting fitting 22 further comprises a third plane 222 opposite to the second plane 221, and the positioning hole 2202 is arranged on the third plane 222, and one positioning hole 2202 is arranged between every two adjacent threaded holes 2201.

[0047] It can be understood that the third plane 222 is a plane opposite to the second plane 221, for example, the second plane 221 is a top surface, and the third plane 222 is a bottom surface. The positioning hole 2202 is arranged on the third plane 222 and does not penetrate through to the second plane 221.

[0048] In this way, the fixing of the three fixing members can form a triangular stable structure, thereby improving the stability of the mounting fitting 22 during rotation, reducing the inaccuracy of test data caused by unstable factors generated by rotation, not only enhancing the stability of the tooling mechanism 20, but also improving the accuracy and reliability of the test, and preventing the displacement or shaking of the mounting fitting 22 during the test.

[0049] The nut anti-loosening torque vibration test method provided in the embodiments of the present application can be applied to a nut anti-loosening torque vibration test device, and at this time, the nut anti-loosening torque vibration test device is the execution subject of the nut anti-loosening torque vibration test method provided in the embodiments of the present application, and the specific type of the nut anti-loosening torque vibration test device is not limited in the embodiments of the present application.

[0050] The nut anti-loosening torque vibration test method provided in the embodiments of the present application can be applied to a nut anti-loosening torque vibration test device, and at this time, the nut anti-loosening torque vibration test device is the execution subject of the nut anti-loosening torque vibration test method provided in the embodiments of the present application, and the specific type of the nut anti-loosening torque vibration test device is not limited in the embodiments of the present application.

[0051] For example, the control device can be a terminal device such as a tablet computer, a notebook computer, an ultra-mobile personal computer (UMPC), a netbook, a desktop computer, a smart large screen, a smart television, a computing device, a computer, a laptop computer, and the like.

[0052] In order to better understand the nut anti-loosening torque vibration test method provided in the embodiments of the present application, the specific implementation process of the nut anti-loosening torque vibration test method provided in the embodiments of the present application is exemplarily introduced below.

[0053] Figure 5 A schematic flowchart of the nut anti-loosening torque vibration test method provided in the embodiments of the present application is shown, and the nut anti-loosening torque vibration test method comprises: S100, the control device detects the specification of the measured screw rod located in the measuring hole through the detection member, and determines the fitting data of the fitting member based on the specification of the measured screw rod; wherein the fitting data indicates a threaded hole corresponding to the specification of the measured screw rod.

[0054] It can be understood that the model of the fitting member determined automatically according to the specification of the measured nut can be understood as determining a specific one threaded hole on the fitting member according to the specification of the currently measured screw rod, and this threaded hole is used for installing the currently measured screw rod.

[0055] Exemplarily, the control device can be detected after receiving the test instruction through wireless or wired mode, and the test instruction can also be input by the operator through the operation interface, or can be automatically sent by other equipment. The detection member detects the fitting data of the fitting member by non-contact measurement on the measured screw rod, for example, uses a laser ranging sensor to obtain the diameter information of the measured screw rod, and sends the diameter information as the fitting data to the control device. The control device is built-in with a data table of the model of the fitting member corresponding to different specifications of the measured screw rod, and according to the received fitting data (i.e. the diameter information of the measured screw rod), the matching fitting member model is found in the data table, and the fitting data can be obtained.

[0056] S200, controlling the rotation source to drive the fitting member to rotate based on the fitting data.

[0057] Exemplarily, according to the threaded hole on the fitting member corresponding to the specification of the measured screw rod indicated by the fitting data, the control device controls the rotation source to drive the fitting member to rotate, so that the threaded hole corresponding to the specification of the measured screw rod is installed on the measured screw rod.

[0058] S300, the control device controls the test mechanism to perform anti-loose torque vibration test on the measured nut threadedly matched on the measured screw rod.

[0059] It can be understood that the anti-loose torque vibration test refers to a test method for simulating a vibration environment, which is used for testing the anti-loose performance of the nut under dynamic load, i.e. testing whether the nut can maintain a fastened state under vibration conditions to prevent loose failure.

[0060] Exemplarily, the control device sends a start instruction to the test mechanism through a preset control program (stored in an internal memory), and the test mechanism receives the instruction and drives the servo motor to apply a rotating torque to the measured screw rod, while starting the vibration table to simulate an external vibration environment; during the test, the control device monitors the running state of the test mechanism in real time, so that the torque and vibration parameters meet the preset values, and the measured screw rod and the measured nut are tested under dynamic load to generate original test data (including torque application value and vibration waveform).

[0061] S400, acquiring torque data through a torque sensor and simultaneously acquiring vibration data through a vibration sensor; Exemplarily, the torque sensor refers to a device (for example, a strain gauge sensor) for measuring the rotational torque, for capturing the torque change of the measured nut; and the vibration sensor refers to a device (for example, an accelerometer) for detecting mechanical vibration, for capturing the vibration amplitude and frequency of the measured nut.

[0062] S500, extracting the torsional vibration mixed data associated with the vibration data from the torque data, and extracting the vibrational torsional mixed data associated with the torque data from the vibration data.

[0063] Exemplarily, the torque sensor can be arranged on the test mechanism, and can be in contact with the test mechanism and the measured nut; the vibration sensor can be arranged on the first plane, and time synchronization can be realized through an internal clock module (for example, a GPS or a crystal oscillator); during the processing operation, the control device simultaneously extracts the analog signals in the torque data and the analog signals in the vibration data, converts them into a digital torque value sequence and a digital vibration value sequence through an A / D converter, the digital torque value sequence includes a torque value sequence and a mixed sequence with a part of the vibration value sequence, and the digital vibration value sequence includes a vibration value sequence and a mixed sequence with a part of the torque value sequence, and the mixed sequence with the part of the vibration value sequence and the mixed sequence with the part of the torque value sequence are determined as the torsional vibration mixed data and the vibrational torsional mixed data respectively.

[0064] S600, performing change trend analysis according to the torsional vibration mixed data, the vibrational torsional mixed data and the accessory data, and generating dynamic test data; wherein the dynamic test data is used to indicate the change trend between the torque and the vibration.

[0065] Exemplarily, the influence between the torque and the vibration can be the influence degree of the test accessory on the anti-loose performance. The control device calls the accessory data from the database, combines the torque sequence and the vibration sequence in the torsional vibration mixed data and the vibrational torsional mixed data, generates the dynamic test data through the accessory thickness and the torque attenuation rate and the vibration frequency, and obtains the change trend between the torque and the vibration, that is, the dynamic correlation data, by calculating the correlation coefficient of the accessory material hardness and the torque retention rate.

[0066] In a possible implementation, please refer to Figure 6 S600, performing change trend analysis according to the torsional vibration mixed data, the vibrational torsional mixed data and the accessory data, and generating dynamic test data, including: S610, analyzing the structural parameters of the installed accessory based on the accessory data, and generating accessory feature data of the installed accessory; wherein the accessory feature data is used to indicate the deformation state and the assembly state of the installed accessory.

[0067] Exemplarily, the deformation state can be understood as the deformation degree of the accessory under load, such as the strain percentage, and the assembly state can be understood as the tightness of the accessory and the measured screw, such as the gap size, to reflect the physical characteristics of the installed accessory and the state during assembly. When analyzing the structural parameters of the installed accessory, the control device can use a predefined formula for the accessory data, that is, the deformation state is calculated based on Hooke's law, that is, the product of the elastic modulus of the material and the cross-sectional area is obtained, and then the product is divided by the load force to obtain the deformation state, and the assembly state can be based on gap measurement, and the assembly state is obtained by subtracting the measured gap from the designed gap, and the key structural characteristics are obtained to obtain the accessory feature data.

[0068] S620, the control device separates the torque signal sequence and the vibration signal sequence from the torsional vibration mixed data and the vibration torsional mixed data.

[0069] It can be understood that the torque signal sequence is a time-ordered list of torque values (for example, [10 N·m, 9.8 N·m, …]); the vibration signal sequence is a time-ordered list of vibration values (for example, [0.5g, 0.6g, …]); and the separation is to extract independent sequences from the mixed data.

[0070] Exemplarily, the control device extracts the torque values in all triplets and sorts them by timestamp through the data analysis program to form the torque signal sequence [19.8, 19.7, …]; similarly, the vibration values are extracted and sorted to form the vibration signal sequence [2.5, 2.6, …], both sequences retain the corresponding relationship with the original timestamp.

[0071] S630, the control device determines the time domain feature points of the deformation state of the installed accessory from the torque signal sequence.

[0072] It can be understood that the time domain feature points are the nodes of the torque signal in the time domain, such as peak value, valley value, mutation point, etc.

[0073] Exemplarily, the control device calculates the torque change rate of adjacent time points for the torque signal sequence, and when the absolute value of the change rate exceeds a preset threshold, it is determined that the time point is a mutation point, that is, an inflection point is identified; for example, the first derivative of the torque sequence is calculated, and when the absolute value of the derivative exceeds the threshold, the time point is marked as a time domain feature point. At the same time, in combination with the deformation state: if the deformation state in the accessory feature data exceeds the threshold, the control device only retains the feature points related to the state (such as filtering out the torque drop points), and finally outputs the feature point list such as the timestamp and the torque value.

[0074] S640, the control device determines the frequency domain resonance band corresponding to the assembly state of the installed accessory from the vibration signal sequence.

[0075] Exemplarily, the frequency domain resonance band is a continuous frequency range on which the energy of the vibration signal is concentrated in the frequency domain, and the range is determined by the assembly state of the mounting fitting. Determining the frequency domain resonance band corresponding to the assembly state of the mounting fitting can be that the amplitude of each frequency point is calculated on the vibration signal sequence, then the resonance band is identified and the amplitude spectrum is calculated, the continuous frequency interval with the amplitude more than 2 times of the average amplitude is found out, and the corresponding frequency domain resonance band is further screened out in combination with the assembly state.

[0076] S650, constructing dynamic test data according to the time domain feature points and the frequency domain resonance band.

[0077] It can be understood that constructing the dynamic test data means that the time domain feature points (time-torque key nodes) and the frequency domain resonance band (frequency range) are associated according to time and integrated into a data set that can reflect the dynamic relationship between the two.

[0078] Exemplarily, the dynamic test data is constructed through the time domain feature point list and the frequency domain resonance band; wherein the construction process can be that the time domain feature points are mapped to the frequency domain resonance band to obtain an association matrix, that is, the time points are listed as torque values and resonance marks, for example, for each feature point time, it is checked whether the time falls within the resonance band and the torque value is recorded to integrate it into the dynamic test data.

[0079] S700, performing correlation influence analysis based on the dynamic test data to obtain dynamic correlation data; wherein the dynamic correlation data is used to reflect the influence between the torque and the vibration.

[0080] Exemplarily, the dynamic correlation data is obtained by calculating the change rate ratio of the torque change amount (for example, the torque change amount of t4-t2 is-1.7N·m) of each time point in the dynamic test data and the frequency offset amount (for example, the lower limit of the resonance band decreases from 220Hz to 200Hz, and the offset amount is 20Hz) of the corresponding resonance band, and then combining a preset weight; or the dynamic correlation data is obtained by calculating the correlation between the torque feature and the resonance state, that is, the dynamic correlation data is obtained by multiplying the proportion of time points with the resonance state of 1 by the torque change rate; for example, the dynamic test data is traversed, the proportion of the number of times of the resonance mark being 1 to the total number of feature points is counted, and then multiplied by the average torque attenuation gradient to output the dynamic correlation data.

[0081] In this way, the dynamic correlation data is derived from the dynamic test data, the overall correlation between the torque and the vibration is quantified, a simple index is provided for decision-making, and the test efficiency is improved; the correlation in the dynamic test data is quantified, and a comparable numerical basis is provided for the correlation degree between the torque vibration test and the fitting.

[0082] In a possible implementation, please refer to Figure 8 S700, performing correlation influence analysis based on the dynamic test data to obtain dynamic correlation data, including: S710, determine the change trajectory of the time domain feature point.

[0083] It can be understood that the change trajectory can be understood as the change path of the torque value of the time domain feature point over time, to reflect the overall change trend of the torque key node.

[0084] Exemplarily, the control device extracts the time and torque value of all time domain feature points (for example, t1:20.0 N·m, t2:19.7 N·m, t4:18.0 N·m, t6:17.5 N·m) from the dynamic test data, draws a scatter plot with time as the horizontal axis and torque value as the vertical axis, and then uses linear fitting to obtain a trend line (for example, torque = -0.05 × time + 20.0), which is the change trajectory of the time domain feature point.

[0085] S720, determine the time sequence correlation between the change trajectory and the frequency domain resonance band based on the change trajectory.

[0086] It can be understood that the time sequence correlation can be understood as the correlation degree of the change trajectory of the time domain feature point and the change of the frequency domain resonance band in time.

[0087] Exemplarily, the control device extracts the center frequency sequence of the frequency domain resonance band (for example, t1:250 Hz, t2:240 Hz, t4:230 Hz, t6:220 Hz) from the dynamic test data, and aligns it with the torque change trajectory of the time domain feature point (t1:20.0, t2:19.7, t4:18.0, t6:17.5) according to time; calculate the Pearson correlation coefficient of both (for example, r=0.92, close to 1), and determine that it is a strong time sequence correlation, that is, the resonance band center frequency decreases synchronously when the torque decreases.

[0088] S730, determine the dynamic correlation data according to the time sequence correlation and the dynamic test data.

[0089] Exemplarily, by setting corresponding weights for the time sequence correlation and the dynamic test data, the weight of the time sequence correlation is set to 0.6, and the weight of the dynamic test data is set to 0.4; that is, the dynamic correlation data can be determined by setting the weight of the time sequence correlation to 0.6 and the weight of the dynamic test data feature value to 0.4, and then according to the known time sequence correlation coefficient r=0.92, the total torque change in the dynamic test data is -2.5 N·m, the total resonance band offset is -30 Hz, and the ratio is 0.083; then the dynamic correlation data = 0.6 × 0.92 + 0.4 × 0.083 ≈ 0.55 + 0.03 = 0.58, wherein the higher the value, the stronger the correlation; in addition, the above numerical examples are only for illustrative purposes, and other actual values can be used, without specific limitations.

[0090] In this way, the trend correlation and the specific feature change are combined, the dynamic correlation data more comprehensively reflects the correlation between the torque and the vibration, and the accuracy of the data is improved.

[0091] S800, effectively verifying the dynamic test data and the dynamic correlation data to obtain a test result; wherein the test result is used to reflect the anti-loose situation of the nut.

[0092] For example, the effective verification is to verify the reliability of the dynamic test data and the dynamic correlation data. The effective verification to obtain the test result can be to obtain first verification data by verifying the dynamic test data, to obtain second verification data by verifying the dynamic correlation data, and to determine the test result by the first verification data and the second verification data.

[0093] In this way, the comprehensive test of the test result can be realized by the above description, the accuracy and the reliability of the data are improved, and a solid foundation is provided for subsequent analysis of the nut anti-loose performance.

[0094] In a possible implementation, please refer to Figure 7 S800, effectively verifying the dynamic test data and the dynamic correlation data to obtain a test result, comprising: S810, verifying the dynamic test data to obtain first verification data; wherein the first verification data is used to reflect the torque stability verification situation of the torque signal change feature and the vibration excitation effectiveness situation of the vibration signal frequency domain feature.

[0095] It can be understood that the torque stability verification situation of the torque signal change feature can be understood as the attenuation trend of the torque signal over time and the effectiveness of the energy concentration degree of the vibration signal in a specific frequency range; Exemplarily, the torque signal output by the torque sensor and the vibration signal output by the vibration sensor are collected, time stamp alignment is performed to form a dynamic test data set, a torque fluctuation threshold is set, the number of fluctuations exceeding the threshold in the signal is calculated, and if the proportion of the number of fluctuations in the total data is ≤3%, it is determined that the torque is stable; the frequency domain effectiveness verification of the vibration signal can be performed by Fourier transform to obtain the frequency components of the signal, and it is checked whether the main frequency falls within the preset test frequency range, and if the energy proportion of the main frequency is ≥70%, it is determined that the vibration excitation is effective. The torque stability result and the vibration excitation effectiveness result are integrated to generate first verification data. It can also be that a sliding window processing is applied to the torque signal sequence collected by the torque sensor, that is, the signal is segmented according to a fixed time window (for example, one window every 0.1 second), the average value of the torque value in each window is calculated, the decay gradient (that is, the difference between the average value of the current window and the average value of the previous window divided by the time interval) is calculated based on the average values of adjacent windows, a torque decay gradient sequence is generated, and then a fast Fourier transform is performed on the vibration signal sequence collected by the vibration sensor to convert the time domain signal into a frequency domain signal, identify the main frequency band, calculate the proportion of the energy in the main frequency band in the total energy, and obtain the main frequency band energy proportion. Finally, the torque decay gradient sequence and the main frequency band energy proportion are judged, and if the absolute value of the torque decay gradient sequence is less than a preset threshold and the main frequency band energy proportion is greater than a preset threshold, it is effective, otherwise it is ineffective, and then integrated into the first verification data.

[0096] In a possible implementation, referring to Figure 7 , S810, verifying the dynamic test data to obtain first verification data, including: S811, performing sliding window processing on the torque signal collected by the torque sensor to generate a torque decay gradient sequence; wherein the torque decay gradient sequence is used to indicate the decay trend of the torque signal over time.

[0097] It can be understood that the sliding window processing is a data processing technology that divides continuous signals into fixed-length time periods (windows) for analysis, that is, it can also be understood that a fixed-length time window (for example, 10 seconds) is set, and the window moves along the time axis (for example, 1 second each time), and the data in the window is calculated; the torque decay gradient sequence used to indicate the decay trend of the torque signal over time can be understood as a sequence composed of the decay rates of the torque signal in each window, which is used to intuitively reflect the decay speed of the torque over time.

[0098] Exemplarily, the sliding window parameters such as window size and step length are set, the original torque signal sequence collected by the torque sensor is divided by the window, each window contains n data points, the average value of the data points in each window is calculated as the representative value of the window, and the decay gradient is calculated, for the representative values of the adjacent two windows, the difference value (the value of the latter window minus the value of the former window) is calculated, and then divided by the time interval (i.e. the step length), to obtain the gradient value at this time point, all gradient values are arranged in time sequence to form a torque decay gradient sequence. For example, 1, set the sliding window parameters: window length T=10 seconds, sliding step length t=1 second; 2, from the start time of the torque signal, the torque data in the first window (for example, the torque value from t=0 to t=10 seconds) is intercepted, the torque change amount in the window (the torque value at the end of the window minus the torque value at the beginning of the window) is calculated, and then divided by the window length T to obtain the torque decay gradient of the window (if the result is negative, it means that the torque decays); 3, move the window along the time axis by t=1 second, intercept the torque data from t=1 to t=11 seconds, and repeat step 2 to calculate the gradient; 4, continue to move the window until it covers all the torque signals, and arrange all the gradient values of the windows in time sequence to generate a torque decay gradient sequence.

[0099] S812, performing fast Fourier transform on the vibration signal collected by the vibration sensor, and calculating the main frequency band energy proportion; wherein, the main frequency band energy proportion is used to indicate the energy concentration degree of the vibration signal in a certain frequency range.

[0100] It can be understood that the fast Fourier transform (FFT) is an algorithm that converts time domain signals into frequency domain signals, reveals frequency components, that is, the energy distribution of different frequency components in the signal can be obtained; the main frequency band is a key frequency range preset by the test (for example, 20-50Hz for nut loosening test); the main frequency band energy proportion is a calculated proportion value, which represents the proportion of signal energy in the main frequency band to the total energy, and is used to know whether the vibration is effectively concentrated in the key frequency band.

[0101] Exemplarily, the original vibration signal sequence collected by the vibration sensor is preprocessed, the preprocessing includes removing the direct current component and windowing to reduce spectral leakage, the signal is segmented into fixed length frames, FFT is performed on each frame to obtain a complex spectrum, then the amplitude square of each frequency point is calculated, and then the total energy is integrated to identify the main frequency band, the sum of the energy of all frequency points in the frequency band is calculated, and then the energy proportion of the main frequency band is calculated. For example, a segment of vibration signal (for example, 10 seconds of vibration acceleration data, sampling frequency 1000Hz) collected by the vibration sensor is intercepted, FFT is performed on the signal to obtain a frequency energy distribution curve, wherein the horizontal axis is frequency (Hz) and the vertical axis is energy value corresponding to the frequency, the main frequency band range (for example, 20-50Hz) is determined, the total energy of all frequencies in the range (E1) is calculated, and the total energy in the entire frequency range (E total) is calculated; the main frequency band energy proportion is E1 / E total x 100% (for example, 75% is calculated), that is, the main frequency band energy proportion value is obtained.

[0102] S813, determine the first verification data according to the torque attenuation gradient sequence and the main frequency band energy proportion.

[0103] Exemplarily, the torque stability determination standard is set, that is, if more than 90% of the gradient values in the torque attenuation gradient sequence are absolute values ≤0.5 N·m / s (that is, the attenuation speed is in the acceptable range), it is determined that the torque signal is stable; the vibration excitation effectiveness determination standard is set, that is, if the main frequency band energy proportion is ≥60%, it is determined that the vibration excitation is effective, and the determination of whether the torque signal is stable and whether the vibration excitation is effective is integrated into the first verification data.

[0104] In this way, by integrating the torque and vibration characteristics, this step integrates the torque and vibration characteristics to provide comprehensive verification output.

[0105] S820, verify the dynamic correlation data to obtain second verification data; wherein the second verification data is used to indicate the state change sequence of the torque and the vibration.

[0106] Exemplarily, according to the dynamic correlation data, the sequence is divided into m sub-segments according to a fixed time window, then the proportion of the correlation value being 1 in each sub-segment is calculated, a correlation confidence vector is generated, a confidence threshold is set, the number of segments whose continuous sub-segment proportion exceeds the threshold is counted, and if the number of continuous qualified segments is greater than or equal to a preset k value, high confidence and related statistics are output to form the second verification data.

[0107] In one possible implementation, please refer to Figure 7 S520, verifying the dynamic correlation data to obtain second verification data, including: S821, dividing the correlation values of the torque test and the vibration test indicated by the dynamic correlation data into m sub-segments according to a time window.

[0108] It can be understood that the time window segmentation can be understood as dividing the continuous time axis into multiple equal length time periods (sub-periods); m sub-periods are the specific number obtained after segmentation (for example, m=10, that is, 10 sub-periods).

[0109] For example, the segmentation into m sub-periods can be that by determining the total duration of the dynamic correlation data (for example, 100 seconds), setting the duration of each time window to 10 seconds, then the number of sub-periods m = total duration / window duration = 10; the correlation value sequence is divided in time sequence, that is, the first sub-period is the correlation value of 0-10 seconds, the second sub-period is the correlation value of 10-20 seconds, …, and the tenth sub-period is the correlation value of 90-100 seconds; if the total duration cannot be divided by the window duration, the last sub-period can include the correlation values of the remaining time (for example, the total duration is 105 seconds, the first 10 sub-periods are each 10 seconds, and the 11th sub-period is the correlation value of 100-105 seconds, that is, m=11).

[0110] S822, calculate the proportion of correlation values of 1 in each period to obtain a correlation confidence vector; wherein the correlation confidence vector is used to indicate the correlation strength of the torque test and the vibration test in each sub-period.

[0111] For example, for each sub-period, the number of correlation values of 1 in the period is counted (for example, the first sub-period has 80 data points, of which 60 are 1), and the proportion of correlation values of 1 in the first sub-period is 60 / 80 x 100%=75%; the proportion values are arranged in the order of sub-periods (from the first to the mth sub-period) to form a correlation confidence vector.

[0112] S823, detect the number of consecutive sub-periods in the correlation confidence vector that exceed the confidence threshold.

[0113] For example, the detection can be that by setting a confidence threshold, starting from the first element of the correlation confidence vector, traversing the vector: if the proportion of the current sub-period is greater than or equal to 70%, record the continuous count (initially 1) and check the next sub-period; if the proportion of the next sub-period is still greater than or equal to 70%, the continuous count is increased by 1; if it is less than 70%, the continuous count is reset to 0; after the traversal is completed, the maximum continuous count is recorded (for example, if there are 5 consecutive sub-periods in the vector whose proportion is greater than or equal to 70%, the continuous number is 5).

[0114] S824, when the number of consecutive qualified periods is greater than or equal to k, generate second verification data.

[0115] Exemplarily, k=3 is set (i.e., the correlation confidence of at least 3 consecutive sub-sections is greater than or equal to 70%); if the number of consecutive sections meeting the standard detected in step S523 is 4 (greater than or equal to 3), it is determined that the dynamic correlation data is valid, and the second verification data is generated; if the number of consecutive sections meeting the standard is 2 (less than 3), it is determined that the correlation stability is insufficient, and the second verification data is marked as invalid, that is, the obtained valid or invalid is integrated into the second verification data.

[0116] In this way, by setting the value of k as a judgment standard, the second verification data is determined to be valid only when the correlation relationship has sufficient persistence, thereby improving the reliability of the torque and vibration state change sequence and providing a basis for subsequent analysis of the dynamic correlation law of the two.

[0117] S830, obtaining a test result according to the first verification data and the second verification data.

[0118] Exemplarily, the verification result of the first verification data and the verification result of the second verification data are integrated into the test result; in addition, if both of them are valid, the dynamic test data (torque signal, vibration signal) and the dynamic correlation data (correlation value sequence) are integrated according to the time stamp to form a structured test result (for example, table data containing time, torque value, vibration value, and correlation value); if any verification data is invalid, the test result is marked as invalid.

[0119] In this way, by integrating the first verification data and the second verification data, the comprehensiveness and accuracy of the test result are improved; if the first verification data indicates that the torque signal is stable and the vibration excitation is effective, and the second verification data indicates that the correlation between the torque and the vibration is strong and stable, the test result is determined to be valid and can be used for subsequent nut anti-loosening performance analysis, so as to be able to test the anti-loosening performance of the nut and optimize the product design or improve the installation process accordingly, thereby improving the overall quality and safety of the product.

[0120] In a possible implementation, the method further includes: S101, the control device analyzes the phase difference time sequence change law of the torque signal and the vibration signal in the dynamic correlation data and the dynamic test data; wherein the phase difference time sequence change law is used to indicate the loosening trend of the measured nut in the torque vibration environment.

[0121] It can be understood that the phase difference can be understood as the phase difference value (reflecting the time difference of the change of the two) of the torque signal and the vibration signal at the same time; the time sequence change law can be understood as the change trend of the phase difference with time (such as gradually increasing, remaining stable, etc.); the loosening trend can be understood as the possibility of the nut gradually loosening over time (the phase difference change law is related to the loosening degree).

[0122] Exemplarily, the torque signal and the vibration signal sequence are extracted from the dynamic test result, and the phase difference is calculated, that is, for each time point, the maximum correlation point between the signals is found by applying the cross-correlation algorithm, the time offset is calculated, and then converted into the phase difference. For example, the period T comes from the main frequency of the signal, and φt = 360 T, a phase difference sequence φ(t) is generated, a linear trend of φ(t) is fitted (a straight line φ(t)=a*t+b is fitted), and the parameter a represents the change rate. The phase difference time sequence change rule is output, and the loosening can be predicted through the phase analysis, and early warning is realized.

[0123] In S102, a phase drift rate is extracted based on the phase difference time sequence change rule; wherein the phase drift rate is used to indicate the change trend of the anti-loosening performance of the measured nut over time.

[0124] Exemplarily, from the phase difference time sequence change curve, a continuous change interval (such as 100-200 seconds) is intercepted, the total change amount Δφ of the phase difference in the interval (for example, from 10° to 40°, Δφ=30°) and the time span Δt (100 seconds) are calculated, and the phase drift rate (v) is calculated, that is, v=Δφ / Δt=30° / 100 seconds=0.3° / second; if v>0 and gradually increases (for example, from 0.1° / second to 0.5° / second), it indicates that the anti-loosening performance is decreasing (loosening is accelerating); if v≈0, it indicates that the anti-loosening performance is stable.

[0125] In S103, a stiffness degradation coefficient of the connection structure of the measured nut is calculated according to the phase drift rate; the stiffness degradation coefficient is used to reflect the stiffness loss of the connection structure of the measured nut over time.

[0126] Exemplarily, based on a pre-established relationship model between the phase drift rate and the stiffness (for example, the relationship model can be obtained through experiments, that is, the stiffness K=K0×(1-v / v0), wherein K0 is the initial stiffness, and v0 is the critical drift rate), and by setting the initial stiffness K0=1000 N / m and the critical drift rate v0=1° / second (exceeding this value, the structure stiffness decreases sharply), if the current phase drift rate v=0.3° / second, the current stiffness K=1000×(1-0.3 / 1)=700 N / m is calculated; the stiffness degradation coefficient=K / K0=700 / 1000=0.7 (indicating that the stiffness loss is 30%), the stiffness degradation coefficient is indirectly calculated through the phase drift rate, the abstract stiffness change is converted into a quantifiable index, and the aging degree of the connection structure is determined intuitively, which provides a basis for predicting the structure failure time. In addition, the above example values are only illustrative and are not limited thereto, and in the actual implementation process, they need to be obtained and calculated according to the actual situation.

[0127] In S104, the test result is determined according to the stiffness degradation coefficient.

[0128] Exemplarily, if the coefficient is greater than or equal to 0.8, the structural stiffness loss is small, and the test result is valid; if the coefficient is greater than or equal to 0.5 and less than 0.8, the torsional vibration mixed data and the torsional vibration mixed data need to be supplemented; if the coefficient is less than 0.5, the test result is invalid (the structure is seriously degraded); if the calculated stiffness degradation coefficient is 0.7 (between 0.5 and 0.8), it is determined that the current test result needs to be supplemented, and the result containing the test to be supplemented is generated; if the coefficient is 0.9 (greater than or equal to 0.8), it is determined that the test result is valid and is directly used; if the coefficient is 0.4 (less than 0.5), the data is marked as invalid and needs to be retested, that is, the valid, invalid, supplemented data and direct use are integrated into the test result.

[0129] In this way, the test result is finally verified from the perspective of structural stiffness, the data can truly reflect the performance of the nut under different stiffness states, the reference value of the test data caused by excessive degradation of the structure is reduced, the practicality of the test result is improved, the anti-loose performance of the measured nut can be effectively determined, the accuracy and reliability of the test are improved, the problems of torque transmission and vibration simulation distortion caused by mismatched accessories are reduced, and therefore the accuracy and consistency of the test are improved.

[0130] It should be understood that the size of the serial number of each step in the above embodiment does not mean the order of execution, and the execution order of each process should be determined according to its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0131] Corresponding to the nut anti-loose torque vibration test method of the above embodiment, the embodiments of the present application also provide a nut anti-loose torque vibration test system, and each unit of the system can realize each step of the nut anti-loose torque vibration test method. Figure 9 The structural block diagram of the nut anti-loose torque vibration test system provided by the embodiments of the present application is shown, and only the parts related to the embodiments of the present application are shown for ease of illustration.

[0132] Referring to Figure 9 The nut anti-loose torque vibration test system comprises: A first control unit is configured to control the device to detect the specification of the measured screw rod located in the measurement hole through the detection member, and determine the accessory data of the installation accessory based on the specification of the measured screw rod; wherein the accessory data indicates a threaded hole corresponding to the specification of the measured screw rod; A second control unit is configured to control the rotation source to rotate the installation accessory based on the accessory data; A third control unit is configured to control the device to control the test mechanism to perform the anti-loose torque vibration test on the measured nut threadedly matched with the measured screw rod; An acquisition unit is configured to acquire torque data through a torque sensor and simultaneously acquire vibration data through a vibration sensor; The extraction unit is configured to extract torsional vibration mixed data associated with the vibration data from the torque data, and extract vibration-torsion mixed data associated with the torque data from the vibration data; The first analysis unit is configured to perform a change trend analysis according to the torsional vibration mixed data, the vibration-torsion mixed data and the accessory data, and generate dynamic test data; wherein the dynamic test data is used to indicate a change trend between the torque and the vibration; The second analysis unit is configured to perform a correlation influence analysis based on the dynamic test data, and obtain dynamic correlation data; wherein the dynamic correlation data is used to reflect an influence between the torque and the vibration; The result unit is configured to perform an effective verification on the dynamic test data and the dynamic correlation data, and obtain a test result; wherein the test result is used to reflect an anti-loosening situation of the nut under test.

[0133] It should be noted that the information interaction and execution process between the above units are based on the same concept as the method embodiments of the present application, and the specific functions and technical effects brought about can be referred to the method embodiments part, which will not be repeated here.

[0134] Those skilled in the art can clearly understand that, for the convenience and brevity of description, only the division of the above functional units and modules is taken as an example for illustration, and in actual application, the above functions can be completed by different functional units and modules according to needs, that is, the internal structure of the system is divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiments can be integrated in one processing unit, or each unit can exist physically, or two or more units can be integrated in one unit. The integrated unit can be realized in the form of hardware or in the form of software functional unit. In addition, the specific names of the functional units and modules are only for easy distinction, and do not limit the protection scope of the present application. The specific working process of the units and modules in the system can refer to the corresponding process in the foregoing method embodiments, which will not be repeated here.

[0135] Figure 10 The control device provided by an embodiment of the present application is shown in a structural schematic diagram. As shown in the figure, the control device 6 of the embodiment includes at least one processor 60 (only one is shown in the figure), at least one memory 61 (only one is shown in the figure), and at least one communication interface 62 (only one is shown in the figure). Figure 10 The processor 60 is configured to execute the program stored in the memory 61 to perform the following steps. Figure 10 The memory 61 is configured to store the program and data required by the processor 60 to execute the program. Figure 10(Only one is shown in the image) and a computer program 62 stored in the at least one memory 61 and executable on the at least one processor 60. When the processor 60 executes the computer program 62, it causes the control device 6 to perform the steps in any of the above embodiments of the nut anti-loosening torque vibration test method, or causes the control device 6 to perform the functions of each module / unit in the above embodiments of the system.

[0136] For example, the computer program 62 may be divided into one or more modules / units, which are stored in the memory 61 and executed by the processor 60 to complete this application. The one or more modules / units may be a series of computer program instruction segments capable of performing a specific function, which describe the execution process of the computer program 62 in the control device 6.

[0137] The control device 6 can be a desktop computer, laptop, or other computing device. This control device may include, but is not limited to, a processor 60 and a memory 61. Those skilled in the art will understand that... Figure 10 This is merely an example of control device 6 and does not constitute a limitation on control device 6. It may include more or fewer components than shown, or combine certain components, or different components, such as input / output devices, network access devices, buses, etc.

[0138] The processor 60 can be a Central Processing Unit (CPU), or it can be other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor can be a microprocessor or any conventional processor.

[0139] The memory 61 can be an internal storage unit of the control device 6, such as a hard disk or a memory of the control device 6 in some embodiments. The memory 61 can also be an external storage device of the control device 6, such as a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card, etc. equipped on the control device 6 in other embodiments. Further, the memory 61 can include both the internal storage unit and the external storage device of the control device 6. The memory 61 is used to store an operating system, an application program, a boot loader, data, and other programs, such as program codes of the computer program, etc. The memory 61 can also be used to temporarily store data that has been output or is to be output.

[0140] The computer program is stored in the computer readable storage medium, and the computer program is executed by the processor to implement the steps in any of the above method embodiments.

[0141] The computer program is stored in the computer readable storage medium, and the computer program is executed by the processor to implement the steps in any of the above method embodiments.

[0142] The integrated unit, if implemented in the form of a software function unit and sold or used as an independent product, can be stored in a computer readable storage medium. Based on such understanding, the present application implements all or part of the processes in the above embodiment methods, which can be completed by instructing related hardware through a computer program. The computer program can be stored in a computer readable storage medium, and the computer program is executed by the processor to implement the steps of each method embodiment. The computer program includes computer program code, which can be in the form of source code, object code, executable files, or some intermediate forms, etc. The computer readable medium at least includes any entity or device capable of carrying the computer program code to the nut anti-loose torque vibration test equipment, recording medium, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signal, telecommunication signal, and software distribution medium. For example, U disk, mobile hard disk, magnetic disk or optical disk, etc.

[0143] In the above embodiments, the description of each embodiment has its own focus, and the parts not described or recorded in detail in a certain embodiment can be referred to the relevant description of other embodiments.

[0144] Those skilled in the art can understand that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be realized by electronic hardware or a combination of computer software and electronic hardware. Whether the functions are realized in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0145] In the embodiments provided in the present application, it should be understood that the disclosed nut anti-loosening torque vibration test system, device and method can be implemented in other ways. For example, the nut anti-loosening torque vibration test system and device embodiments described above are merely schematic, for example, the division of the modules or units is merely a logical function division, and actual implementation can have another division manner, for example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the displayed or discussed each other can be indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0146] The units described as separate components can or can not be physically separate, and the components shown as units can or can not be physical units, that is, they can be located in one place, or they can be distributed on a plurality of network units. Part or all of the units can be selected according to actual needs to achieve the purpose of the embodiments of the present application.

[0147] The above-described embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can be modified, or some technical features can be replaced by equivalents; and these modifications or replacements do not make the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application.

Claims

1. A nut loosening torque vibration testing device, comprising: frame; A tooling mechanism, set on the frame, is used to install the screw to be tested and the nut to be tested that is threaded into the screw to be tested; as well as The testing mechanism, set on the frame, is used to perform torque vibration testing on the nut under test; The tooling mechanism is characterized in that it includes measuring components, mounting accessories, connecting components, a rotation source, and a detection component; The measuring element is connected to the mounting accessory via the connector, and the measuring element and the mounting accessory are rotatably mounted on the frame around a first axis; the rotation source is mounted on the frame, and the power output end of the rotation source is connected to the measuring element, the mounting accessory, or the connector, for driving the measuring element and the mounting accessory to rotate; The measuring component has a first plane, and the mounting accessory has a second plane. The first plane and the second plane are coplanar. A measuring hole for placing the screw to be measured is provided on the first plane, and multiple threaded holes of different specifications are provided on the second plane. The measuring hole and each of the threaded holes are on the same circle, and the center of the circle is on the first axis. The detection element is disposed on the inner wall of the measuring hole and is used to detect the size of the screw being measured placed in the measuring hole; After the testing component completes the dimensional inspection of the screw under test, the screw under test is disengaged from the measuring hole, and the rotation source drives the mounting accessory to rotate so that the threaded hole of the corresponding specification moves to the position corresponding to the screw under test, and then the screw under test is screwed into the threaded hole of the corresponding specification.

2. The nut loosening torque vibration testing device as described in claim 1, characterized in that, The tooling mechanism further includes a gripping assembly, which is disposed on the frame and is used to grip the screw under test after the test piece completes the dimensional test of the screw under test so as to disengage it from the measuring hole, and to screw the screw under test into the threaded hole of the corresponding specification after the rotation source drives the mounting accessory to rotate so that the threaded hole of the corresponding specification moves to the position corresponding to the screw under test.

3. The nut loosening torque vibration testing equipment as described in claim 1 or 2, characterized in that, The mounting accessories and the measuring element are detachably connected via the connector.

4. The nut loosening torque vibration testing device as described in claim 3, characterized in that, The mounting accessory is a ring-shaped structure with a notch, and the measuring element is located inside the notch; the connecting element is located inside the mounting accessory.

5. The nut loosening torque vibration testing equipment as described in claim 1, 2, or 4, characterized in that, The mounting accessory has multiple positioning holes circumferentially arranged around the first axis; the tooling mechanism also includes a fixing member, which is movably disposed on the frame and is used to insert into the corresponding positioning hole after the rotation source drives the mounting accessory to rotate, so that the threaded hole of the corresponding specification moves to the position corresponding to the screw being tested.

6. The nut loosening torque vibration testing device as described in claim 5, characterized in that, The mounting accessory also includes a third plane, which is opposite to the second plane. The positioning hole is formed on the third plane, and one positioning hole is provided between every two adjacent threaded holes.

7. A method for testing the anti-loosening torque vibration of a nut, characterized in that, The nut anti-loosening torque vibration testing device according to any one of claims 1 to 6 further includes a control device, a vibration sensor and a torque sensor, wherein the vibration sensor is disposed on the measuring element and the torque sensor is disposed on the testing mechanism; The control device is communicatively connected to the torque sensor and the vibration sensor, and the method includes: The control device detects the specifications of the screw being tested located in the measuring hole through the detection element, and determines the accessory data of the mounting accessories based on the specifications of the screw being tested; wherein, the accessory data indicates the threaded hole corresponding to the specifications of the screw being tested; Based on the accessory data, the rotation source is controlled to drive the installation accessory to rotate; The control device controls the testing mechanism to perform an anti-loosening torque vibration test on the nut that is threaded into the screw being tested; Torque data is acquired through the torque sensor, and vibration data is acquired simultaneously through the vibration sensor. Extract torsional-vibration hybrid data associated with the vibration data from the torque data, and extract vibration-torsional hybrid data associated with the torque data from the vibration data; Based on the torsional vibration mixed data, the vibration-torsional mixed data, and the component data, trend analysis is performed to generate dynamic test data; wherein, the dynamic test data is used to indicate the trend of change between torque and vibration; Based on the dynamic test data, a correlation influence analysis is performed to obtain dynamic correlation data; wherein, the correlation data is used to reflect the influence between torque and vibration. The dynamic test data and the dynamic correlation data are effectively verified to obtain test results; wherein, the test results are used to reflect the anti-loosening status of the tested nut.

8. The nut loosening torque vibration test method as described in claim 7, characterized in that, The process of effectively verifying the dynamic test data and the dynamic correlation data to obtain test results includes: The dynamic test data is verified to obtain the first verification data; wherein, the first verification data is used to reflect the torque stability verification of the torque signal change characteristics and the vibration excitation effectiveness of the vibration signal frequency domain characteristics; The dynamic correlation data is verified to obtain second verification data; wherein, the second verification data is used to indicate the state change sequence of torque and vibration; The test results are obtained based on the first verification data and the second verification data.

9. The method for testing the anti-loosening torque vibration of a nut as described in claim 8, characterized in that, The verification of the dynamic test data to obtain the first verification data includes: The torque signal acquired by the torque sensor is processed by a sliding window to generate a torque decay gradient sequence; wherein, the torque decay gradient sequence is used to indicate the decay trend of the torque signal over time. The vibration signal collected by the vibration sensor is subjected to a fast Fourier transform, and the energy ratio of the main frequency band is calculated; wherein, the energy ratio of the main frequency band is used to indicate the degree of energy concentration of the vibration signal within a specific frequency range; The first verification data is determined based on the torque attenuation gradient sequence and the main frequency band energy ratio.

10. The nut anti-loosening torque vibration test method as described in claim 8, characterized in that, The verification of the dynamically associated data to obtain second verification data includes: The correlation values ​​of torque test and vibration test indicated by the dynamic correlation data are divided into m sub-segments according to a time window; The proportion of correlation values ​​of 1 within each segment is calculated to obtain the correlation confidence vector; wherein, the correlation confidence vector is used to indicate the strength of the correlation between torque test and vibration test within each sub-segment; Detect the number of segments in the associated confidence vector that continuously exceed the confidence threshold; When the number of consecutively qualified segments is greater than or equal to k, the second verification data is generated.

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